Merge pull request #3996 from tricknotes/include-version-to-header-comment

Include version to header comment
small computed docs fixes
Merge pull request #3997 from twokul/computed-doc-fixes

small computed docs fixes
[DOC beta] Ember.View documentation cleanup.
[DOC beta] Several doc fixes
[DOC beta] Cleanup Ember.TrackedArray docs.
Label promises for debugging
[beta] Update handlebars to 1.2.1.
Merge pull request #3927 from rjackson/warn_on_missing_template

[DOC beta] Assert if template for {{render}} not found.
Merge pull request #4002 from twokul/runloop-doc-fixes

[DOC beta] Several doc fixes
Merge pull request #4003 from rjackson/cleanup_tracked_array

[DOC beta] Cleanup Ember.TrackedArray docs.
Merge pull request #4001 from rjackson/view_doc_cleanup

[DOC beta] Ember.View documentation cleanup.
Merge pull request #3944 from rjackson/cleanup_unquoted_render_usage

Assert if {{render}} is called with an unquoted name.
Merge pull request #3946 from teddyzeenny/new-promise-labels

Label Promises
Merge pull request #3999 from rjackson/update_handlebars

[beta] Update handlebars to 1.2.1.
[BUGFIX release] Update Metamorph

Fixes https://github.com/tomhuda/metamorph.js/issues/30 and https://github.com/emberjs/ember.js/issues/3779
Merge pull request #4010 from ebryn/update-metamorph

[BUGFIX release] Update Metamorph
[BUGFIX release] Update Backburner.js

Includes improved debug performance
Merge pull request #4011 from ebryn/update-backburner

[BUGFIX release] Update Backburner.js
[DOC beta] Cleanup Ember.TextField docs.